It is a complaint without foundation that "to very few people is granted the faculty of comprehending what is imparted to them, and that most, through dullness of understanding, lose their labor and their time." On the contrary, you will find the greater number of men both ready in conceiving and quick in learning, since such quickness is natural to man. As birds are born to fly, horses to run, and wild beasts to show fierceness, so to us peculiarly belong activity and sagacity of understanding.

However many things we may have done, we are yet to a certain degree fresh for that which we are going to begin. Who, on the contrary, would not be stupified if he were to listen to the same teacher of any art, whatever it might be, through the whole day? But by change a person will be recruited, as is the case with respect to food, by varieties of which the stomach is re-invigorated and is fed with several sorts less unsatisfactorily than with one.

H.E. Butler's translation:

However manifold our activities, in a certain sense we come fresh to each new subject. Who can maintain his attention, if he has to listen for a whole day to one teacher harping on the same subject, be it what it may? Change of studies is like change of foods: the stomach is refreshed by their variety and derives greater nourishment from variety of viands.

Book I, Chapter XII, 5

Adeo facilius est multa facere quam diu.

So much easier is it to do many things than to do one thing for a long time continuously.

In either case the orator should bear clearly in mind throughout his whole speech what the fiction is to which he has committed himself, since we are apt to forget our falsehoods, and there is no doubt about the truth of the proverb that a liar should have a good memory.

For it is an ordinance of nature that nothing great can be achieved in a moment, and that all the fairest tasks are attended with difficulty, while on births as well she has imposed this law, that the larger the animal, the longer should be the period of gestation.

Let the orator whom I propose to form, then, be such a one as is characterized by the definition of Marcus Cato, a good man skilled in speaking. But the requisite which Cato has placed first in this definition—that an orator should be a good man—is naturally of more estimation and importance than the other.

But I fancy that I hear some (for there will never be wanting men who would rather be eloquent than good) saying "Why then is there so much art devoted to eloquence? Why have you given precepts on rhetorical coloring and the defense of difficult causes, and some even on the acknowledgment of guilt, unless, at times, the force and ingenuity of eloquence overpowers even truth itself? For a good man advocates only good causes, and truth itself supports them sufficiently without the aid of learning."

To say the truth, whatever improvement private study may produce, there is still a peculiar advantage attendant on our appearance in the forum, where the light is different and there is an appearance of real responsibility quite different from the fictitious cases of the schools. If we estimate the two separately, practice without learning will be of more avail than learning without practice.